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3.4 Using concentrations of solutions in mol/dm3

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Question 41

A laboratory technician prepares a potassium chloride solution for a laboratory test.

Relative formula mass (MrM_rMr​): KCl=74.5\text{KCl} = 74.5KCl=74.5

a.

To prepare the sample, the technician places 7.45 g of potassium chloride into a flask and dissolves it in water. Calculate the amount of potassium chloride, in mol\text{mol}mol, represented by the measured mass.

[2]
b.

The technician then adds water until the solution occupies 400 cm3. Use this final volume to calculate the concentration of the solution in mol/dm3\text{mol/dm}^3mol/dm3.

[2]
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3.4 Using concentrations of solutions in mol/dm3 Questions

  1. GCSE
  2. /Chemistry
  3. /3.4 Using concentrations of solutions in mol/dm3

106 exam-style questions on AQA GCSE Chemistry 3.4 Using concentrations of solutions in mol/dm3, covering 3.4.1 Concentration in mol/dm3. Each one has a worked solution and a mark scheme showing where the marks go.

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